Matt Warman looks at the latest Blackberry. Will it revive Research in
Motion's fortunes?

There has never been more pressure on a single device than there is on the BlackBerry Z10. This is the phone, along with its keyboard-wielding sibling, that must save BlackBerry, challenge Apple and stem the dominance of Google’s Android. It’s a phone that must surpass every expectation and achieve things that no user even contemplated a mobile phone could do. Can it get close to that impossible goal?